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Paper Abstract and Keywords
Presentation 2014-11-18 14:50
Coupling Coefficient Estimation Using Impedance Inverter Coil in Dynamic Wireless Power Transfer System for Electric Vehicles
Daita Kobayashi, Takehiro Imura, Yoichi Hori (Univ. of Tokyo) WPT2014-54
Abstract (in Japanese) (See Japanese page) 
(in English) To implement dynamic wireless charging to electric vehicles using wireless power transfer, a system which senses the presence of vehicles and turns on/off the primary coils is necessary. Therefore, a system that automatically turns on/off by using impedance inverter coil to change the primary input impedance was proposed.
In systems of dynamic charging, the control of the secondary impedance with DC-DC converter is needed in order to optimize their efficiency or transmitting power. Moreover, the coupling coefficient between coils needs to be estimated from the secondary voltage or current. However, the estimation of coupling coefficient is difficult because secondary voltage has a peak. In this paper, a new advantage of using a impedance inverter coil that enables the estimation of coupling coefficient by moving the peak of the secondary voltage is introduced and experimentally verified.
Keyword (in Japanese) (See Japanese page) 
(in English) wireless power transfer / magnetic resonant coupling / dynamic wireless charging / coupling coefficient / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 310, WPT2014-54, pp. 21-26, Nov. 2014.
Paper # WPT2014-54 
Date of Issue 2014-11-11 (WPT) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee EE WPT  
Conference Date 2014-11-18 - 2014-11-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Doshisha University 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To WPT 
Conference Code 2014-11-EE-WPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Coupling Coefficient Estimation Using Impedance Inverter Coil in Dynamic Wireless Power Transfer System for Electric Vehicles 
Sub Title (in English)  
Keyword(1) wireless power transfer  
Keyword(2) magnetic resonant coupling  
Keyword(3) dynamic wireless charging  
Keyword(4) coupling coefficient  
1st Author's Name Daita Kobayashi  
1st Author's Affiliation The University of Tokyo (Univ. of Tokyo)
2nd Author's Name Takehiro Imura  
2nd Author's Affiliation The University of Tokyo (Univ. of Tokyo)
3rd Author's Name Yoichi Hori  
3rd Author's Affiliation The University of Tokyo (Univ. of Tokyo)
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Date Time 2014-11-18 14:50:00 
Presentation Time 25 
Registration for WPT 
Paper # IEICE-WPT2014-54 
Volume (vol) IEICE-114 
Number (no) no.310 
Page pp.21-26 
#Pages IEICE-6 
Date of Issue IEICE-WPT-2014-11-11 

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